Zircon U-Pb Geochronology and Geochemistry of Cambrian Plutons in Xinglong Area of Northern Da-Hinggan Mountains: Implications for Tectonic Evolution
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摘要: 大兴安岭北部兴隆地区位于新林-喜桂图缝合带北部，额尔古纳地块南缘，在大地构造上属于兴蒙造山带北段.然而，由于资料有限，前人对该区寒武纪侵入岩的构造产出环境仍存有争议，从而制约了人们对于新林-喜桂图洋早期构造演化的正确认识.选取兴隆地区出露的寒武纪内河岩体为研究对象，通过岩相学、锆石U-Pb年代学及地球化学研究，以期限定其形成时限，探讨其岩石成因和构造背景，进而为解决上述问题提供新的证据.内河岩体中石英二长岩及侵入其中的辉石闪长岩的LA-ICP-MS锆石U-Pb年龄分别为508±3 Ma和507±5 Ma，证明其形成时代均为中寒武世.石英二长岩和辉石闪长岩样品为高钾钙碱性和钙碱性系列，同时表现出轻稀土元素富集和不同程度的亏损Nb、Ta和Ti.两组样品的Nb/Ta平均值分别为22.41和17.12，较高于原始地幔平均值，MgO的含量（< 8%）和Mg#（42~70）值较低.上述地球化学特征为典型俯冲带岩石的特征，暗示内河岩体为经历了俯冲板片析出流体交代作用的原始地幔部分熔融的产物.结合区域已有近同时代侵入岩、蛇绿混杂岩和蓝片岩资料，推测内河岩体可能形成于活动大陆边缘构造环境，为寒武纪期间新林-喜桂图洋向北俯冲的弧岩浆作用的产物.研究结果为兴蒙造山带北段在寒武纪期间仍处于俯冲构造环境提供了重要依据.Abstract: The Xinglong area in the northern Da-Hinggan Mountains is located in the north of the Xinlin-Xiguitu suture zone and the southern margin of the Erguna block and belongs to the northern Xingmeng orogenic belt. However, the tectonic settings for the Cambrian plutons have been still in debate due to the absence of available data, which hampers our understanding of the early tectonic evolution of Xinlin-Xiguitu Ocean. In this study, it carries out a detailed investigation on the Neihe pluton from the Xinglong area using zircon U-Pb dating and whole-rock geochemistry to constrain the age and petrogenesis, and provides new evidence for solving the problems. The LA-ICP-MS zircon U-Pb ages for the quartz monzonite and pyroxene diorite are 508±3 Ma and 507±5 Ma, respectively, indicating that they were formed during the Middle Cambrian. Geochemically, the quartz monzonite and pyroxene diorite are high-K calc-alkaline and calc-alkaline series, and both are enriched in light rare earth elements and show variable degrees of negative anomalies of Nb, Ta and Ti. The Nb/Ta ratios for the quartz monzonite and pyroxene diorite are 22.41 and 17.12, respectively, and they are low in the contents of the MgO(< 8%) and Mg# values (42-70). These geochemical features are typical of subduction-related rocks, suggesting that the studied rocks may be generated by partial melting of a primitive mantle source modified by subduction-related fluids. Combined with available data from coeval plutons, ophiolitic mélanges, and blueschists, the Neihe pluton should be generated in an active continental margin setting related to the Cambrian northward subduction of the northern Xinlin-Xiguitu Ocean. New findings provide important evidence for the early subductionrelated tectonic evolution of the Xingmeng orogenic belt.
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Key words:
- Cambrian /
- Erguna block /
- zircon U-Pb geochronology /
- Xinlin-Xiguitu Ocean /
- Xingmeng orogenic belt /
- geochemistry
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图 2 东北地区岩浆事件分布及构造分区
Fig. 2. Tectonic division of the NE China and distributions of magmatic events
图 3 采样点地质图
修改自黑龙江省地质矿产局(1961)1:20万《兴隆沟幅》区域地质调查报告；黑龙江地质调查研究总院(2008) 1:25万《兴隆幅》区域地质调查报告
Fig. 3. Geological map of sampling locations
图 4 研究区采样点照片
a.采样位置图；b, c.辉石闪长岩与岩体接触关系；d.石英二长岩；e.辉石闪长岩
Fig. 4. Photos of sampling locations in the study area
图 5 研究区侵入岩正交偏光下照片
a, b.石英二长岩；c, d.辉石闪长岩；Hbl.普通角闪石；Pl.斜长石；Qtz.石英；Kfs.碱性长石；Zrn.锆石；Cpx.单斜辉石
Fig. 5. Othogonal polarized images of plutons in the study area under orthogonal polarization
图 6 大兴安岭北部内河岩体代表性锆石CL阴极发光图像
a.石英二长岩18XL-46；b.辉石闪长岩18XL-51
Fig. 6. Cathodoluminescence images of typical zircons in the Neihe pluton from the northern Da-Hinggan Mountains
图 7 锆石U-Pb年龄谐和图以及加权平均年龄图
a, b.石英二长岩；c, d.辉石闪长岩
Fig. 7. Zircon U-Pb age harmonics and weighted average age diagrams
图 8 大兴安岭北部寒武纪侵入岩地球化学图解
a.硅-全碱图解，据Le Bas et al.(1986)，其中碱性和亚碱性边界据Irvine and Baragar (1971)；b.SiO2-K2O图解, 据Peccerillo and Taylor(1976)
Fig. 8. Geochemical illustration of Cambrian plutons in the northern Da-Hinggan Mountains
图 9 大兴安岭北部寒武纪侵入岩稀土元素球粒陨石标准化图(a)和微量元素原始地幔标准化图(b)
a.稀土元素球粒陨石标准化图；b.微量元素原始地幔标准化图.其中球粒陨石和原始地幔数值据Sun and McDonough(1989)
Fig. 9. Chondrite-normalized REE patterns (a) and primitive mantle-normalized trace elements spider diagrams (b) of Cambrian plutons in the northern Da-Hinggan Mountains
图 10 大兴安岭北部寒武纪侵入岩形成环境构造判别图
a.Th-Hf-Ta图，据Wood(1980)；b. Nb/Yb-Th/Yb图, 据Pearce(2008)；c. YbN-(La/Yb)N图; d. Y-Sr/Y图; 图c和d据Martin(1999)；e. Th/Zr-Nb/Zr图解, 据Kepezhinskas et al.(1997). N-MORB.正常型洋脊玄武岩；E-MORB.异常型洋脊玄武岩；WPT.板内拉斑玄武岩；WPA.碱性板内玄武岩；VAB.火山弧玄武岩；VA.火山弧；SHO.钾玄质；CA.钙碱性；TH.拉斑质；S.俯冲相关富集；W.板内相关富集
Fig. 10. Tectonic environment discrimination for the Cambrian plutons from the northern Da-Hinggan Mountains
图 11 大兴安岭新元古代-早奥陶世构造演化模式
Fig. 11. Neoproterozoic-Early Ordovician tectonic evolution model of the Da-Hinggan Mountains
表 1 大兴安岭北部内河岩体主量元素（%）和微量元素（10-6）测试结果
Table 1. Results of major elements (%) and trace elements (10-6) in the Neihe pluton in the northern Da-Hinggan Mountains
样品号 18XL-46 18XL-47 18XL-51 18XL-52 岩性 石英二长岩 石英二长岩 辉石闪长岩 辉石闪长岩 SiO2 58.43 58.94 51.47 51.42 TiO2 0.77 0.71 1.12 1.12 Al2O3 17.05 17.13 15.10 15.06 Fe2O3 T 6.83 6.78 8.07 8.16 MgO 2.51 2.36 9.35 9.47 MnO 0.13 0.13 0.15 0.15 CaO 6.30 6.32 7.60 7.50 Na2O 3.65 3.65 2.66 2.65 K2O 2.94 2.92 0.83 0.98 P2O5 0.31 0.30 0.33 0.33 LOI 0.84 0.63 3.02 2.99 Total 99.76 99.87 99.69 99.82 Sc 13.37 14.75 19.18 22.59 V 124.40 123.42 135.41 152.92 Cr 11.98 10.54 432.89 565.47 Co 12.89 11.71 35.36 40.38 Ni 5.54 5.00 235.63 274.05 Ga 23.48 23.52 17.77 19.58 Rb 77.52 80.90 38.26 51.36 Ba 1 055 1 098 260 313 Th 5.02 6.63 5.21 4.43 U 1.64 1.43 1.18 1.01 Nb 11.12 11.57 8.80 9.36 Ta 0.49 0.52 0.59 0.48 Sr 828.06 873.75 573.30 516.72 Y 20.55 24.41 19.75 20.31 Zr 210.97 193.39 163.89 172.26 Hf 4.55 4.22 4.01 3.48 Cs 0.72 0.81 0.94 0.70 La 31.99 43.71 26.63 25.66 Ce 65.00 78.56 57.79 54.21 Pr 7.63 8.73 6.95 6.31 Nd 31.11 35.25 28.05 25.30 Sm 5.93 6.68 5.66 4.98 Eu 1.81 1.80 1.61 1.54 Gd 4.97 5.84 5.13 4.56 Tb 0.65 0.77 0.75 0.63 Dy 3.49 4.07 4.01 3.48 Ho 0.64 0.74 0.78 0.65 Er 1.90 2.17 2.21 1.91 Tm 0.25 0.28 0.29 0.24 Yb 1.73 1.84 1.90 1.57 Lu 0.25 0.26 0.28 0.22 (La/Sm)N 3.49 4.22 3.04 3.33 (La/Yb)N 13.25 17.06 10.07 11.69 δEu 0.99 0.86 0.90 0.97 REE 157.36 190.70 142.04 131.27 LREE 141.66 172.94 125.08 116.46 HREE 15.70 17.76 16.96 14.81 LREE/HREE 9.02 9.74 7.38 7.86 
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表 2 额尔古纳地块新元古代-早奥陶世侵入岩锆石定年结果
Table 2. Results of Neoproterozoic-Early Ordovician plutons in the Erguna block
采样位置 年龄±误差(Ma) 测试方法 岩性 参考文献 环二库地区 557±2 LA-ICP-MS 花岗闪长岩 Feng et al., 2018 会宝沟地区 523±2 LA-ICP-MS 闪长岩 Feng et al., 2017 漠河县洛古河 517±9 SHRIMP 石英闪长岩 Wu et al., 2005 十七站和新村 512±4 LA-ICP-MS 二长闪长岩 柴明春等，2018 漠河县洛古河 504±8 SHRIMP 二长花岗岩 Wu et al., 2005 漠河县西门都里河 502±7 LA-ICP-MS 二长花岗岩 秦秀峰等，2007 漠河县 502±7 SHRIMP 二长花岗岩 秦秀峰等，2007 呼玛县哈拉巴奇 500±2 LA-ICP-MS 二长花岗岩 隋振民等，2006 韩家园子 500±1 LA-ICP-MS 花岗闪长岩 Ge et al., 2005 塔河县十八站 499±1 LA-ICP-MS 二长花岗岩 Ge et al., 2005 塔河县城北 494±9 LA-ICP-MS 正长花岗岩 Ge et al., 2005 塔河西 493±5 LA-ICP-MS 二长花岗岩 Ge et al., 2005 塔河县 492±5 LA-ICP-MS 正长花岗岩 Ge et al., 2005 塔河岩体 490±3 LA-ICP-MS 细粒辉长岩 Ge et al., 2005 塔林西公路旁 485±3 LA-ICP-MS 二长花岗岩 Ge et al., 2005 塔河县东 480±4 LA-ICP-MS 正长花岗岩 Ge et al., 2005
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